The Palomar knot has always been real good to me. It's has a 98% breaking strength, small, and real easy when fingers are cold. What ever knot you used make sure to wet it while you tying it because the friction of tying the knot will weaken the knot. The only 100% knot that I know of is the "Jimmy Houston knot". The reason I don't use that one is because larger and harder to tie when fingers are cold.